723 search results for "parallel"

Magnetic Resonance Imaging in R

December 29, 2011
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Volume 44 of the Journal of Statistical Software was published in October 2011.  The special volume on “Magnetic Resonance Imaging in R” features articles and packages related to a variety of imaging modalities:functional MRIdiffusion-weighted MRIdynamic contrast-enhanced MRIdynamic susceptibility-contrast MRI structural MRIThe papers describe the methodology, software implementation and provide comprehensive examples and data. ...

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Norman Nie on two big problems with Big Data

December 23, 2011
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Revolution Analytics CEO Norman Nie sat down with Cassimir Medford from Business Agility to talk about the problems business today face with respect to Big Data. The two big problems identified: finding adequately trained personnel and locating the right tools. Norman traces the problem of finding skilled practitioners to work with Big Data to the US educational system: The...

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R 2.14.1 is released

December 22, 2011
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Peter Dalgaard announced today the release of the new R version 2.14.1.  Bellow is the announcement.  For R users who are using windows, I suggest to also have a look at one of the following two posts, suggestion an alternative strategy for how to more easily upgrade R under Windows XP, or under windows 7 (which tends to have more permission...

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R 2.14.1 is released

December 22, 2011
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Source distributions of the latest maintenance release of R, R 2.14.1, are now available. Binary distributions will begin appearing on local CRAN mirrors in the next few days. This update makes a few small improvements (such as the ability to accurately count the number of available cores for parallel processing on Solaris and Windows, and improved support of grayscale...

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LondonR recap

December 10, 2011
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LondonR recap

The biggest and perhaps best meeting yet. The talks James Long: “Easy Parallel Stochastic Simulations using Amazon’s EC2 & Segue”.  This was a lively talk about James’ package to use Amazon’s cloud to speed up a (huge) call to lapply.  The good part is that if you want to use Amazon as your cloud provider, … Continue reading...

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LondonR, 6 December 2011

December 10, 2011
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LondonR, 6 December 2011

The London R user group met again last Wednesday at the Shooting Star pub. And it was busy. More than 80 people had turned up. Was it the free beer and food, sponsored by Mango which attracted the folks or the speakers? Or the venue? James Long, who or...

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Code Optimization: One R Problem, Thirteen Solutions – Now Sixteen!

December 8, 2011
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Code Optimization: One R Problem, Thirteen Solutions – Now Sixteen!

Introduction The old r-wiki optimisation challenge describes a string generation problem which I have bloged about previously both here and here. The Objective To code the most efficient algorithm, using R, to produce a sequence of strings based on a single integer input, e.g.: Solutions One Through Thirteen A variety of different approaches are illustrated on the

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The Art of R Programming – my two cents

December 5, 2011
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The Art of R Programming – my two cents

What makes this book different from other books about R is stated clearly by the author Norman Matloff in the introduction:"This book is not a compendium of the myriad types of statistical methods that are available in the wonderful R package. It r...

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Review of Distance Course: Graduate Certificate in Statistics offered at Sheffield [completed: 3 June 2012]

December 1, 2011
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Recently, on Andrew Gelman's blog there was a discussion about how to get yourself a statistics education (presumably without going through the whole process of becoming a professional statistician). Here's the discussion on Gelman's blog, with lots of...

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The art of R programming

November 29, 2011
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The art of R programming

This is a gem of a book. It will become the book I give PhD students when they are learning how to write good R code. That is, if I ever see it again. I had hoped to write a review of it, but I haven’t seen it since it arrived in the mail a

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